ledc test code

ledc.c

/* LEDC (LED Controller) fade example
   This example code is in the Public Domain (or CC0 licensed, at your option.)
   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/ledc.h"
#include "esp_err.h"
#include "driver/uart.h"

#define LEDC_HS_TIMER          LEDC_TIMER_0
#define LEDC_HS_MODE           LEDC_HIGH_SPEED_MODE
#define LEDC_HS_CH0_GPIO       (2)
#define LEDC_HS_CH0_CHANNEL    LEDC_CHANNEL_0

#define LEDC_TEST_CH_NUM       (1)
#define LEDC_TEST_DUTY         (8191)
#define LEDC_TEST_FADE_TIME    (3000)
#define LEDC_DUTY_RESOLUTION    (LEDC_TIMER_8_BIT)
#define LEDC_FREQ               (20000)

void app_main()
{
    uart_set_baudrate(0,115200);
    int ch;
    ledc_timer_config_t ledc_timer = {
        .duty_resolution = LEDC_DUTY_RESOLUTION, // resolution of PWM duty
        .freq_hz = LEDC_FREQ,                      // frequency of PWM signal
        .speed_mode = LEDC_HS_MODE,           // timer mode
        .timer_num = LEDC_HS_TIMER            // timer index
    };

    ledc_timer_config(&ledc_timer);

    ledc_channel_config_t ledc_channel = {
            .channel    = LEDC_HS_CH0_CHANNEL,
            .duty       = 0,
            .gpio_num   = LEDC_HS_CH0_GPIO,
            .speed_mode = LEDC_HS_MODE,
            .hpoint     = 0,
            .timer_sel  = LEDC_HS_TIMER
    };
    ledc_channel_config(&ledc_channel);
    ledc_fade_func_install(0);

    while (1) {
        printf("\n1. LEDC fade to duty = %d, duty resolution = %d, frequency = %d\n", LEDC_TEST_DUTY, LEDC_DUTY_RESOLUTION, LEDC_FREQ);
        ledc_set_fade_with_time(ledc_channel.speed_mode,
                ledc_channel.channel, LEDC_TEST_DUTY, LEDC_TEST_FADE_TIME);
        ledc_fade_start(ledc_channel.speed_mode,
                ledc_channel.channel, LEDC_FADE_NO_WAIT);
        vTaskDelay(6000 / portTICK_PERIOD_MS);

        printf("\n2. LEDC set to duty = %d, duty resolution = %d, frequency = %d\n", LEDC_TEST_DUTY/2, LEDC_DUTY_RESOLUTION, LEDC_FREQ);
        ledc_set_duty(ledc_channel.speed_mode, ledc_channel.channel, LEDC_TEST_DUTY/2);
        ledc_update_duty(ledc_channel.speed_mode, ledc_channel.channel);

        vTaskDelay(6000 / portTICK_PERIOD_MS);
    }
}